title: Is UCP2 gene polymorphism associated with decreased resting energy expenditure in nondialyzed chronic kidney disease patients?
abstract: OBJECTIVE
  The deletion/deletion (del/del) polymorphism of uncoupling protein 2 (UCP2) was associated with decreased energy expenditure in diabetic and obese patients. There is evidence of decreased resting energy expenditure (REE) in chronic kidney disease (CKD) patients not yet on dialysis. However, whether REE is associated with the UCP2 polymorphism was not previously investigated in this population. This study evaluated whether the del/del polymorphism of the UCP2 gene is associated with lower REE in nondialyzed CKD patients.
  
  
  METHODS
  This was a cross-sectional study.
  
  
  METHODS
  Forty-four nondialyzed CKD patients (29 male; aged 52 +/- 12 years; creatinine clearance, 37 +/- 13 mL/min/1.73 m(2) [values are mean +/- SD unless otherwise noted]) were included. Their REE was assessed by indirect calorimetry, and body composition by bioelectrical impedance. High-sensitivity C-reactive protein (hs-CRP) was also evaluated. The insertion/deletion (ins/del) polymorphism of the UCP2 gene was determined in all participants. To test whether the deletion/deletion (del/del) polymorphism of the UCP2 gene was associated with lower REE, the REE of carriers of the del/del genotype (n = 24; group Del) was compared with that of carriers of the insertion and ins/del genotype (n = 20; group Ins).
  
  
  METHODS
  The main outcome measure was REE.
  
  
  RESULTS
  The REE of group Del was similar to that of the group Ins (1379 +/- 239 kcal/day vs. 1360 +/- 289 kcal/day, respectively, P = NS). This result was maintained even after the REE was adjusted for lean body mass by analysis of covariance. In addition, in a multiple-regression analysis using REE as the dependent variable, only lean body mass and hs-CRP were significant predictors of REE.
  
  
  CONCLUSIONS
  The results suggest that the del/del polymorphism of the UCP2 gene is not associated with lower REE in nondialyzed CKD patients.
authors.affiliation: Department of Medicine, Division of Nephrology, Federal University of São Paulo, São Paulo, Brazil.
authors.forename: Carla Maria
authors.initials: CM
authors.lastname: Avesani
authors.forename: Maria Ayako
authors.initials: MA
authors.lastname: Kamimura
authors.forename: Simone
authors.initials: S
authors.lastname: Utaka
authors.forename: Roberto
authors.initials: R
authors.lastname: Pecoits-Filho
authors.forename: Louise
authors.initials: L
authors.lastname: Nordfors
authors.forename: Peter
authors.initials: P
authors.lastname: Stenvinkel
authors.forename: Bengt
authors.initials: B
authors.lastname: Lindholm
authors.forename: Sergio Antônio
authors.initials: SA
authors.lastname: Draibe
authors.forename: Lilian
authors.initials: L
authors.lastname: Cuppari
mesh_terms: D001481:Basal Metabolism / Q000235:genetics*; D001823:Body Composition / Q000502:physiology; D002097:C-Reactive Protein; D002153:Calorimetry, Indirect; D003404:Creatinine / Q000378:metabolism / Q000652:urine; D003430:Cross-Sectional Studies; D017097:Electric Impedance; D005260:Female; D017353:Gene Deletion; D005838:Genotype; D005919:Glomerular Filtration Rate / Q000502:physiology; D006801:Humans; D007473:Ion Channels / Q000235:genetics*; D007676:Kidney Failure, Chronic / Q000235:genetics* / Q000378:metabolism* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D024101:Mitochondrial Proteins / Q000235:genetics*; D011110:Polymorphism, Genetic; D000071246:Uncoupling Protein 2
chemical_list: D007473:Ion Channels; D024101:Mitochondrial Proteins; C000604389:UCP2 protein, human; D000071246:Uncoupling Protein 2; D002097:C-Reactive Protein; D003404:Creatinine